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    <script>
        //检测是否为数组
        //(1)instanceof 运算符 它可以用来检测是否为数组
        var arr=[];
        var obj={};
        console.log(arr instanceof Array);
        console.log(obj instanceof Array);
        //(2) Array.isArray(参数); 检测数组H5新增的方法
        console.log(Array.isArray(arr));
    </script>
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